Total length packed approximately 10 cm

container has 3 Ta heat shields.

No endcaps inserted to facilitate out-gassing

Two TaC coated Ta wire springs inserted at both ends.

Initially to ramp TGHT and TBHT to 40 A at 0.5 A/min

Then heat ramping TGHT manually and automatically  to reach 400 A  (Omega slope set = 0.990)

Then ramp to temperature = 1800 C

TBHT will be set fixed at 230 A (max).  TBHT heated manually and automatically to max.

Good vac at 3.00 e -5 Torr

Bad vac at 5.00 e-5 Torr

Initial IGP1 = 6.45e-07 Torr

 

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Friday, July 17, 2020, 20:49

TBHT = 38.9 A, 0.47 V

TGHT = 39.7 A, 0.59 V

IGP1 = 9.1e-06 Torr

Autoramp to 50 A at 0.5 A/min for both TGHT and TBHT

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 Saturday, July 18, 2020, 09:04

IGP1 = 1.6e-06 Torr

TGHT = 50.5 A, 0.76V

TBHT = 49.7 A, 0.62 V

Starting autoramp at 0.5 A/ min to 400 A TGHT and 230 A TBHT

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Saturday, July 18, 2020, 10:17

IGP1 = 5.06e-05 torr

stopped autoramp and allow pressure to decrease and stabilize

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Saturday, July 18, 2020, 10:47 

IGP1 = 6.65 e-06 Torr and trending down

TGHT = 55.4 A, 0.83 V

TBHT= 54.6 A, 0.68 V

Change autoramp to 0.25 A/min for both heaters (.05 increments and 120s wait) 

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Sunday, July 19, 2020, 08:46 

 IGP1= 2.2 e-05 Torr

TBHT = 109.5 A, 1.6 V

TGHT = 106.6 A, 1.7 V

increased ramping rate to .5A/min by decreasing wait intervals to 60 s

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Sunday, July 19, 2020, 14:55 

IGP1 = 7.1 e -06 Torr

TGHT = 271.8 A, 4.7 V

TBHT = 233.1 A, 4.1 V

Increasing ramping rate to 1 A/min 

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